TriLib is a Unity model loader package designed to allow the user to load various 3D model formats inside the Unity editor or during the game execution.
Imports 40+ file formats.
Supports external and embedded materials.
Supports skinned meshes and animations.
Mesh post-processing features.
Multi-platform: Windows Store, Windows, Linux, OSX, Android and iOS.
For a complete list of supported file formats:
http://ricardoreis.net/?p=81